Fixed small typos in docs. Added a cross-ref.

docs/patterns/flashing.rst

@@ -30,7 +30,7 @@ So here is a full example::
                request.form['password'] != 'secret':
                 error = 'Invalid credentials'
             else:
-                flash('You were sucessfully logged in')
+                flash('You were successfully logged in')
                 return redirect(url_for('index'))
         return render_template('login.html', error=error)
 
@@ -100,7 +100,7 @@ to the :func:`~flask.flash` function::
 
 Inside the template you then have to tell the
 :func:`~flask.get_flashed_messages` function to also return the
-categories.  The loop looks slighty different in that situation then:
+categories.  The loop looks slightly different in that situation then:
 
 .. sourcecode:: html+jinja